Propulsive thrust ring system
CA 2109608 C · Owner: Lemont Aircraft Corporation · Inventors: Lemont, Harold E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low-aspect ratio propeller system is provided with a multiple ring structure (42) formed with a plurality of circular or non-circular; annular narrrow, equivalent air foil rings (56.1 56.2, 56.3; 56.4) which are, held by rails (44) in a predetermined relationship with the propeller blades (44). The upstream ping (56.1) is located downstream from the tip vortex of the propeller (44) within the axial span of the propeller. One or more additional downstream-located rings (56.2 56.3, 56.4), are used so as to provide at least one annular multiple ring-defined pump aperture (60, 62; 64) through or which peripheral vortices generated by the propeller blades (44) or fan blades may enhance the …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 28, 1992 and granted September 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.